1 /* $OpenBSD: auth2-passwd.c,v 1.22 2024/05/17 00:30:23 djm Exp $ */
2 /*
3 * Copyright (c) 2000 Markus Friedl. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26 #include <sys/types.h>
27
28 #include <stdlib.h>
29 #include <string.h>
30 #include <stdarg.h>
31 #include <stdio.h>
32
33 #include "packet.h"
34 #include "ssherr.h"
35 #include "log.h"
36 #include "sshkey.h"
37 #include "hostfile.h"
38 #include "auth.h"
39 #ifdef GSSAPI
40 #include "ssh-gss.h"
41 #endif
42 #include "monitor_wrap.h"
43 #include "misc.h"
44 #include "servconf.h"
45
46 /* import */
47 extern ServerOptions options;
48 extern struct authmethod_cfg methodcfg_passwd;
49
50 static int
userauth_passwd(struct ssh * ssh,const char * method)51 userauth_passwd(struct ssh *ssh, const char *method)
52 {
53 char *password = NULL;
54 int authenticated = 0, r;
55 u_char change;
56 size_t len = 0;
57
58 if ((r = sshpkt_get_u8(ssh, &change)) != 0 ||
59 (r = sshpkt_get_cstring(ssh, &password, &len)) != 0 ||
60 (change && (r = sshpkt_get_cstring(ssh, NULL, NULL)) != 0) ||
61 (r = sshpkt_get_end(ssh)) != 0) {
62 freezero(password, len);
63 fatal_fr(r, "parse packet");
64 }
65
66 if (change)
67 logit("password change not supported");
68 else if (mm_auth_password(ssh, password) == 1)
69 authenticated = 1;
70 freezero(password, len);
71 return authenticated;
72 }
73
74 Authmethod method_passwd = {
75 &methodcfg_passwd,
76 userauth_passwd,
77 };
78